Long-Term Debt

Long-term debt consists of the following:



	March 31, 2017							December 31, 2016
	Principal Amount		Unamortized Premium, Discount and Debt Issuance Costs			Net Long-term Debt		Principal Amount		Unamortized Premium, Discount and Debt Issuance Costs			Net Long-term Debt
Revolving credit facility	$	250,000	$	—		$	250,000	$	325,000	$	—		$	325,000
4.625% senior notes due 2021 (the "4.625% Westlake 2021 Senior Notes")	624,793		25,123			649,916		624,793		26,837			651,630
4.625% senior notes due 2021 (the "4.625% Subsidiary 2021 Senior Notes")	63,207		2,690			65,897		63,207		2,862			66,069
3.60% senior notes due 2022	250,000		(1,806		)	248,194		250,000		(1,891		)	248,109
4.875% senior notes due 2023 (the "4.875% Westlake 2023 Senior Notes")	433,793		12,840			446,633		433,793		13,431			447,224
4.875% senior notes due 2023 (the "4.875% Subsidiary 2023 Senior Notes")	16,207		519			16,726		16,207		540			16,747
3.60% senior notes due 2026 (the "3.60% 2026 Senior Notes")	750,000		(10,564		)	739,436		750,000		(10,757		)	739,243
Loan related to tax-exempt waste disposal revenue bonds due 2027	10,889		—			10,889		10,889		—			10,889
6 ½% senior notes due 2029	100,000		(898		)	99,102		100,000		(916		)	99,084
6 ¾% senior notes due 2032	250,000		(1,853		)	248,147		250,000		(1,883		)	248,117
6 ½% senior notes due 2035 (the "6 ½% 2035 GO Zone Senior Notes")	89,000		(828		)	88,172		89,000		(839		)	88,161
6 ½% senior notes due 2035 (the "6 ½% 2035 IKE Zone Senior Notes")	65,000		(594		)	64,406		65,000		(602		)	64,398
5.0% senior notes due 2046 (the "5.0% 2046 Senior Notes")	700,000		(25,876		)	674,124		700,000		(26,017		)	673,983
Long-term debt, net	$	3,602,889	$	(1,247	)	$	3,601,642	$	3,677,889	$	765		$	3,678,654

Credit Agreement

At March 31, 2017, the Company had $250,000 of borrowings outstanding under the Credit Agreement. The interest rate on the borrowings outstanding under the revolving credit facility was 2.34% at March 31, 2017. The Credit Agreement matures on August 23, 2021. As of March 31, 2017, the Company had outstanding letters of credit totaling $76,493 and borrowing availability of $673,507 under the Credit Agreement. As of March 31, 2017, the Company was in compliance with the total leverage ratio financial maintenance covenant.

3.60% Senior Notes due 2026 and 5.0% Senior Notes due 2046

In August 2016, the Company issued $750,000 aggregate principal amount of 3.60% senior notes due 2026 (the "3.60% 2026 Senior Notes") and $700,000 aggregate principal amount of 5.0% senior notes due 2046 (the "5.0% 2046 Senior Notes"). The 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes are the Company's senior obligations and are guaranteed on a senior basis by certain of the Company's existing and future domestic subsidiaries. The 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes and guarantees are unsecured and rank equally with the Company's existing and future senior unsecured obligations and each guarantor's existing and future senior unsecured obligations. In connection with the private offering and issuance of the 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes, the Company entered into a registration rights agreement pursuant to which, among other things, the Company agreed to file with the SEC a registration statement relating to an offer to exchange the 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes for new SEC-registered notes (the “2026 and 2046 Exchange Notes”) containing terms substantially identical to the 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes (except that the transfer restrictions on the 2026 and 2046 Exchange Notes will be modified or eliminated and there will be no registration rights). The indenture governing the 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes contains customary events of default and covenants that will restrict the Company's and certain of its subsidiaries' ability to (1) incur certain secured indebtedness, (2) engage in certain sale-leaseback transactions and (3) consolidate, merge or transfer all or substantially all of the Company's or their assets.

On March 27, 2017, the Company commenced registered exchange offers to exchange the 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes for new notes that are identical in all material respects to the 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes, except that the offer and issuance of the new SEC-registered notes have been registered under the Securities Act of 1933, as amended (the “Securities Act”). The exchange offers expired on April 24, 2017, and approximately 99.97% of the 3.60% 2026 Senior Notes and 100.00% of the 5.0% 2046 Senior Notes were exchanged. The 3.60% 2026 Senior Notes and the 5.0% 2046 Senior Notes that were not exchanged pursuant to the exchange offers have not been registered under the Securities Act or any state securities laws and may not be offered or sold in the United States absent registration or an applicable exemption from registration requirements or a transaction not subject to the registration requirements of the Securities Act or any state securities law.

4.625% Senior Notes due 2021 and 4.875% Senior Notes due 2023

In September 2016, the Company issued $624,793 aggregate principal amount of 4.625% senior notes due 2021 (the “4.625% Westlake 2021 Senior Notes”) and $433,793 aggregate principal amount of 4.875% senior notes due 2023 (the “4.875% Westlake 2023 Senior Notes”) upon the closing of the Company’s offers to exchange (the “Axiall Exchange Offers”) any and all of the $688,000 aggregate principal amount of the outstanding 4.625% senior notes due 2021 issued by Eagle Spinco Inc., a wholly-owned subsidiary of Axiall (“Eagle Spinco”), and the $450,000 aggregate principal amount of the outstanding 4.875% senior notes due 2023 issued by Axiall. In the Axiall Exchange Offers, $624,793 aggregate principal amount of 4.625% Westlake 2021 Senior Notes and $433,793 aggregate principal amount of 4.875% Westlake 2023 Senior Notes were issued by the Company, leaving outstanding $63,207 aggregate principal amount of the 4.625% 2021 senior notes (the "4.625% Subsidiary 2021 Senior Notes") and $16,207 aggregate principal amount of the 4.875% 2023 senior notes (the " 4.875% Subsidiary 2023 Senior Notes"). The Subsidiary Notes are the senior unsecured obligations of Axiall and Eagle Spinco, respectively. The 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes are the Company's senior obligations and are guaranteed on a senior basis by certain of the Company's existing and future domestic subsidiaries. The 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes and guarantees are unsecured and rank equally with the Company's existing and future senior unsecured obligations and each guarantor's existing and future senior unsecured obligations. In connection with the private offering and issuance of the 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes, the Company entered into a registration rights agreement pursuant to which, among other things, the Company agreed to file with the SEC a registration statement relating to an offer to exchange the 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes for new SEC-registered notes (the “2021 and 2023 Exchange Notes”) containing terms substantially identical to the 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes (except that the transfer restrictions on the 2021 and 2023 Exchange Notes will be modified or eliminated and there will be no registration rights). The indenture governing the 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes contains customary events of default and covenants that will restrict the Company's and certain of its subsidiaries' ability to (1) incur certain secured indebtedness, (2) engage in certain sale-leaseback transactions and (3) consolidate, merge or transfer all or substantially all of the Company's or their assets.

On March 27, 2017, the Company commenced registered exchange offers to exchange the 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes for new SEC-registered notes that are identical in all material respects to the 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes, except that the offer and issuance of the new notes have been registered under the Securities Act. The exchange offers expired on April 24, 2017, and approximately 99.97% of the 4.625% Westlake 2021 Senior Notes and 100.00% of the 4.875% Westlake 2023 Senior Notes were exchanged. The 4.625% Westlake 2021 Senior Notes and the 4.875% Westlake 2023 Senior Notes that were not exchanged pursuant to the exchange offers have not been registered under the Securities Act or any state securities laws and may not be offered or sold in the United States absent registration or an applicable exemption from registration requirements or a transaction not subject to the registration requirements of the Securities Act or any state securities law.

As of March 31, 2017, the Company was in compliance with all of the covenants with respect to the Credit Agreement, 3.60% 2026 Senior Notes, 5.0% 2046 Senior Notes, 4.625% Westlake 2021 Senior Notes, 4.875% Westlake 2023 Senior Notes, 3.60% Senior Notes Due 2022, 6 ½% senior notes due 2029, the 6 ¾% senior notes due 2032, the 6 ½% 2035 GO Zone Senior Notes, the 6 ½% 2035 IKE Zone Senior Notes and the waste disposal revenue bonds.

Unamortized debt issuance costs on Long-term debt were $23,767 and $24,113 at March 31, 2017 and December 31, 2016, respectively.